In preparation for a new region mode, do not, for example, allow
'ram' decoders to be assigned to 'pmem' regions and vice versa.
Signed-off-by: Dan Williams <dan.j.williams@xxxxxxxxx>
---
drivers/cxl/core/region.c | 6 ++++++
1 file changed, 6 insertions(+)
diff --git a/drivers/cxl/core/region.c b/drivers/cxl/core/region.c
index c9e7f05caa0f..53d6dbe4de6d 100644
--- a/drivers/cxl/core/region.c
+++ b/drivers/cxl/core/region.c
@@ -1217,6 +1217,12 @@ static int cxl_region_attach(struct cxl_region *cxlr,
struct cxl_dport *dport;
int i, rc = -ENXIO;
+ if (cxled->mode != cxlr->mode) {
+ dev_dbg(&cxlr->dev, "%s region mode: %d mismatch: %d\n",
+ dev_name(&cxled->cxld.dev), cxlr->mode, cxled->mode);
+ return -EINVAL;
+ }
+
if (cxled->mode == CXL_DECODER_DEAD) {
dev_dbg(&cxlr->dev, "%s dead\n", dev_name(&cxled->cxld.dev));
return -ENODEV;
